Bit-holder



UNITED sTATEs PATENT oEEioE.

BENJAMIN B. HILL, OF GHICOPEE, MASSACHUSETTS.

BIT-HOLDER.

Specification of Letters Patent No. 18,282, dated September 29, 1857.

To all whom t may concern:

Be it known that I, BENJAMIN B. HILL, of Chicopee, in the county of I-Iampden and St-ate of Massachusetts, have invented an Improvelnent in Bit-Holders; and I do hereby declare that the following is a full and eXact description thereof, reference being had to the accompanying drawing and to the letters and figures marked thereon.

vFigure I is a perspective view of a bitstock with the attached bit-holder. Fig. II side view of the bit-holder, the bevel gear being detached. Fig. III-front view of the same.

My invention consists of a curved arm, so constructed that it can be attached to the common bit-stock, and at the same time give support and bearing to two bevel gears, placed at an angle of about fortyfive degrees with each other and having near the lower gear a flat rest or bearer by means of which the bit is held in a fixed position with reference to the axis of rotation of the stock, when in use, the whole arrangement being such that holes can be bored in the corner of a room (as in bell hanging) while the hand, revolving with the bow of the stock is at some distance from the walls of the apart-ment.

The common bit-stock is represented at A, B, C Fig. Iand connected with it at D, E, F, is the diagonal bit-holder, which may be permanently affixed to the stock at A, or it may have a square shank G, like the common bit, and bedetached at pleasure. The circular arm or connection is made in two parts, which are attached to each other by the screws I-I. H', and in each of these parts there is a cylindrical box or bearing I and I within which play the shafts or aXes of the bevel gears J and K which are placed at an angle of about forty-live degrees with each other as above mentioned. The upper gear J, is held in place by a suitable collar L and steady-pin P, and the base of the lower gear K rests upon the flat part Q near to the lower connecting arm. The axis of the lower gear K is enlarged at R and has a square socket S, to receive the shank of the bit. Upon one side of the lower connecting arm there is a projection T, extending about one eighth of an inch outside of the gear K, and having a flat or plane surface as shown at U, Fig. III; this may be about half an inch, or one inch in area; when the tool is in use, this rests against the wall or side of any object that is at right angles with the hole that is to be bored; it sustains a part of the thrust or pressure that is communicated from the stock, giving a firm bearing or support to the bit, and at the same time it traverses forward, as the hole is bored, in the direct-ion of the aXis of the bit.

I claim- The diagonal bit-holder having a projection or rest T, which forms a guard to the bevel gears and gives support to the bit, as herein described.

BENJAMIN B. HILL. [Ls] In presence of- AMORY DooLITTLE, S. M. ADAMS. 

